<template>
  <view>
    <!-- 使用自定义搜索组件 -->
    <my-search @click="searchClick"></my-search>
    <!--  <my-search :bgcolor="'green'" :radius="10" @click="searchClick"></my-search> -->
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->

      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>

      <!-- 右侧的滚动视图区域 -->

      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title"> {{item2.cat_name}} </view>
          <!-- 动态渲染三级分类的列表数据 -->
          <view class="cate-lv3-list">
            <!-- 三级分类 Item 项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3">
              <!-- 图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>


    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        // 二级分类列表
        cateLevel2: [],
        // 滚动条距离顶部的距离
        scrollTop: 0,

      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      // 可用高度 = 屏幕高度 - navigationBar高度 - tabBar高度 - 自定义的search组件高度
      this.wh = sysInfo.windowHeight - 50
      // 调用获取分类列表数据的方法
      this.getCateList()

    },
    methods: {
      async getCateList() {
        // 发起请求
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        // 判断是否获取失败
        if (res.meta.status !== 200) return uni.$showMsg()
        // 转存数据
        this.cateList = res.message
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
        // console.log(this.cateLevel2)
        // console.log(this.cateLevel2[0].children[0].cat_icon)

      },

      activeChanged(i) {
        this.active = i
        // 为二级分类列表重新赋值
        this.cateLevel2 = this.cateList[i].children
        // 让 scrollTop 的值在 0 与 1 之间切换
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      searchClick() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }



    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
  }

  .left-scroll-view {
    width: 120px
  }

  .left-scroll-view-item {
    background-color: #F7F7F7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;

    &.active {
      position: relative;
      background-color: #FFFFFF;

      &::before {
        content: ' ';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #C00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
</style>